tyler/proxmox-backup
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

src/rrd/rrd.rs: implement DST_DERIVE

Browse Source
This commit is contained in:
Dietmar Maurer 2020-05-24 17:03:02 +02:00
parent 4fb05fde17
commit 58edd33d2b
1 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
src/rrd/rrd.rs
View File

@ -34,6 +34,7 @@ struct RRA {
resolution: u64,
last_update: u64,
last_count: u64,
counter_value: f64, // used for derive/counters
data: [f64; RRD_DATA_ENTRIES],
}
@ -43,6 +44,7 @@ impl RRA {
flags, resolution,
last_update: 0,
last_count: 0,
counter_value: f64::NAN,
data: [f64::NAN; RRD_DATA_ENTRIES],
}
}
@ -63,7 +65,7 @@ impl RRA {
}
}
fn compute_new_value(&mut self, epoch: u64, value: f64) {
fn compute_new_value(&mut self, epoch: u64, mut value: f64) {
let reso = self.resolution;
let index = ((epoch/reso) % (RRD_DATA_ENTRIES as u64)) as usize;
let last_index = ((self.last_update/reso) % (RRD_DATA_ENTRIES as u64)) as usize;
@ -77,7 +79,20 @@ impl RRA {
self.last_count = 0;
}
let new_count = self.last_count + 1; // fixme: check overflow?
let new_count = if self.last_count < u64::MAX {
self.last_count + 1
} else {
u64::MAX // should never happen
};
if self.flags.contains(RRAFlags::DST_DERIVE) {
let diff = if self.counter_value.is_nan() { 0.0 } else { value - self.counter_value };
self.counter_value = value;
value = diff/(reso as f64);
if !last_value.is_nan() { value += last_value };
}
if self.last_count == 0 {
self.data[index] = value;
self.last_count = 1;